Their prophet Brigham Young.
The headquarters of the Church of Jesus Christ of Latter-day Saints (commonly called the "Mormon" church) between 1839 and 1846 was in Nauvoo, Illinois.
The largest and most popular community of members of the Church of Jesus Christ of Latter-day Saints (the "Mormon" church) was in Nauvoo. Now, much of the city is a tourist attraction with living history actors and exhibits.
The Mormon exodus to Utah officially began on February 4, 1846, although in reality many families stayed in Nauvoo, Illinois later in the year. Almost everyone had left by September to join the others moving west.
Between 1839 and 1846, most of the members of the Church of Jesus Christ of Latter-day Saints (the "Mormon" church) lived in or near Nauvoo, Illinois. They intended to establish Nauvoo as a religious community, but were asked to leave by the local government in 1845, after their prophet, Joseph Smith, was murdered. This is because the government could not stop non-Mormon locals from raiding Nauvoo and neighboring Mormon settlements. It is an important place in Mormon history because it is the first place where they were able to build the first 'full service' Mormon temple. A previous one in Kirtland, Ohio was used for meetings but Nauvoo had the first temple dedicated to performing ordinances such as baptism and marriage. At it's peak, Nauvoo was the second largest city in Illinois (behind Chicago) and with it's strategic location on the Mississippi River, was a popular stopping point for tourists and merchants. Entire books have been written about this period, so it would be impossible to describe the history of the community here. You can check out the "Related Links" below to learn more about Nauvoo and it's history.
Nauvoo Temple was created in 1846.
The first temple in Illinois was in Nauvoo, which was built in the 1840's. It was destroyed by fire in 1848 and rebuilt in 2002. There is also a temple near Chicago. You can read about the Navuoo temple here: www.ldschurchtemples.com/nauvoo and the Chicago temple here: www.ldschurchtemples.com/chicago
The first Mormons left Nauvoo in February 1846.
The Mormons were settled in Nauvoo, Illinois on the banks of the Mississippi river. They were then forced to leave in 1846, essentially the then United States and travel to what is now Utah. Brigham Young, the prophet at the time, led them there, as he saw in a vision the place where they were to go and flourish, as they did in Utah. They reached the Salt Lake valley in 1847.
Mormon Battalion was created in 1846.
The Mormon Trail started in February 1846.
William Huntington - Mormon - died in 1846.
Somewhere between 16,000 and 20,000 Mormons fled Nauvoo, Illinois in 1846 and 1847. It is nearly impossible to count exactly how many fled, as many stayed behind for months or years in an attempt to sell their property for a fair price, and still others stayed because they did not agree with the leadership of Brigham Young.